G PHYSICS
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G05 CONTROLLING; REGULATING
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G05F SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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3/00 Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
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G05F3/02 Regulating voltage or current
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G05F3/08 wherein the variable is DC
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G05F3/10 using uncontrolled devices with non-linear characteristics
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G05F3/16 being semiconductor devices
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G05F3/20 using diode- transistor combinations
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